Hammer.



GEORG-E Ia. KOLLOCK AND ROBERT P. MARTIN, OF SEATTLE, WASHINGTON,ASSIGNORS T0 UNIVERSAL HAMMER COMPANY, OF SEATTLE, WASHINGTON, ACORPORATION OF WASHINGTON.

HAMMER.

Specification of Letters Patent.

Patented fully 11, 1916,.

Application filed. September 7, 1915. Serial No. 49,243.

To all whom it may concern:

Be it vknown that we, Gnoncn'll... Kor.- LooK and ROBERT P. MARTIN,citizens o f the United States, residing at Seattle, in the county ofKing and State ofWashmgton, have invented certain new and usefulTmprovments in Hammers, of which the following is a specification.

This invention relates to improvements 1n electrically actuated springhammers and the object of the improvement is to provide a tool of thisclass that is cheap and simple in its form of construction andv eiicientin its operation. i

A further object is to provide a tool of this class having means forquickly and easily adjusting the force and frequency ofthe blows of thehammer element.

n rThe invention consists in the novel con-` struction, adaptation andcombination of parts of a spring hammer and actuating mechanismtherefor, as will be more clearly described in the followingspecification, illustrated in the accompanying drawings, and finally setforth in the appended claims.

Tn the drawings, Figure 1 is a view in vertical section of ahammerpmbodying this invention; Fig. 2 is a view in cross section of thesame on broken line 2 2 of Fig. 1; and Fig. 3' is a view in sideelevation of one form of actuating screw that may be adapted for use inthe hammer.

Referring to the accompanying drawings, throughout which like referencenumerals indicate like parts, the numeral 5 indicates an outer casing orshell within which is disposed an inner casing 6 of shorter length thanthe casing 5 and hav-ing its walls spaced therefrom toprovide `anannular chamber for a spring 7. Thevcasing 6 is preferably screwedwithin the top end of the casing 5 and is provided with an enlarged topportion 8 to which a cover plate 9 may be secured by screws l0.

Within the casing 6 is' disposed a hollow screw member 1l that isprovided on its top end with an integrally formed gear wheel 12 havingan annular boss 13 on its bottom side that coacts with the top of thecasing 5 to form a runway for balls 14 that form a ball-bearing on whichthe screw 11 may rotate. The bottom end of the screw 11 is-journaled inplate 15 that is screwed into the lower end of the'casing 6.`

16 is a hammer element having an inpawl 19 having tegral collar 17 uponwhich is formed an upwardly projecting shank. 18- within the top end ofwhich is pivoted a spring-pressed n a head 20 that normally engageswithin the groove of the screw 11 and is lifted thereby when the screwis rotated thg direction indicated by the arrow A in The collar 17supports a suitablev bearing plate 21 for the spring 7 and the hammershaft 16 projects outwardly through a tubular guide member 22 providedon a plate 23 that screws into or is otherwise rigidly connected withthe end of the casing Uoncentrically disposed within the hollow screw l1is a smaller screw 25 upon which is threaded a nut 26 that terminates 1na trip member 27 which projects outwardly through a slot 28 in the screw11 and 1s adapted to be moved up or down by rotation of the screw 25.The screw 25 is provided with a hand-wheel 30 -that lis preferablypositioned within a recess 31 in the top of the cover-plate 9. l

The pawl 19 is provided with a transverse slot 32 through which extendsa cross-pin 33 that serves to hold the pawl in a'released positlonduring the outward stroke of the hammer.

. The gear wheel 12` meshes with another ygear-*wheel 34C on the shaft35 of a motor 36 that is secured in any suitable manner to the casing 5,and is connected with a source of electrical current by electric'circuit wires 37.

The cover plate 9`is preferably providedv4 with a handle 38 of anydesirable form. f-lv.4

Tn Fig. .-3 we have illustrated an alternative form 0f screw oractuating member 4:0 that is provided with a spiral groove 4:1 `and hasone side cut away, as at 12, for

vthe head 20 will engage and follow the groove of the screw l1 and thehammer shaft and connected 'parts will be lifted against the'compression of the spring.

When the pawl head 20 encounters the trip member 27 it will be deflectedout of the groove of the screw 1l into the position.

shown in Figs. l and 2,7thus permitting the compressed spring 7 to drivethe hammer shaft outwardly and strike a blow. As soon as the hammer hasreached' the outermost -limit of its stroke, the head 2O of the pawl 19is again picked up by the screw 11 and is withdrawn in a similarymanner. for another blow. When the pawl 19 is moved outward into'theposition shown in Figs.

1 and 2, thescross-pin 33 drops behind'the top of the shank 18 and holdsthe pawl 1n a withdrawn position until the ends of the pm` stroke maybe-varied by turning the screw` '25and adjusting the position of thetrlp member 27, thus if light blows in rapid succession are desired, thetrip member is moved -downward near the bottom of the screw 11 and ifheavy blows in less rapld succession are desired, the trip member 27 yis moved upwardly near the top of the A constant length of stroke may beobtained by using the form of screw shown in Fig. 3 and forming a rigidpawl on the top of a Shank that corresponds to the shank 18. The pawl inthis -case will follow the spiral groove 41 until it is released bypass-l ing out of such groove and allows the hammer to descend.

Having described our invention, what we claim, is-

l 1. A device of the classl described, comprising a rotatable shafthaving a spiral groove, a hammer element provided with a pawl forengaging within said groove, means for rotating said shaft, and meansfor disengaging said pawl from said groove.

2. A device of the class described, comprising a rotatably mountedscrew-threaded l member, a hammer element, a -compression ISIS springengaging therewith, a pawl associated with said hammer element to engagesaid screw, and means adjustable length. wise of said screw for'effecting the diseni* gagement of said pawl from said screw.

3. A device of the classdescribed, com;- prising a hollow screwk havinga longitudinal sl'ot, a trip member disposed within said screw andadjustable longitudinally in said slot, a hammer element having a springpressed pawl that engages said screw, a compression spring, and meansfor rotating said screw Eto move said hammer element and compress saidspring.

1. A device of the class described, comprismg an outer casing, a hammerelement reciprocable longitudinally therein, a compression springengaging said hammer element, an inner casing, a screw rotatably mountedwithin said inner casing,y a springpressed pawl associated with saidhammer element to engage said screw, means for rotating said screw tomove said hammer element and compress said spring, and a trip membermovable longitudinally of said screw to trip said pawl whereby thelength of stroke of said hammer element may be varied.

5. A device of the class described, comprising an outer casing, a hammerelement reciprocable longitudinally therein, a compression springengaging said hammer element, a hollow slotted screw shaft, a pawl onsaid hammer element to engage with said hollow screw shaft, a smallerscrew disposed within said hollow screw, a trip member screwed onto saidsmaller shaft and movable longitudinally of said Slot to trip said pawl,and means for rotating said hollow shaft to move said hammer andcompress said Spring- 6.v hammer of the class described, comprising anouter casing, an inner casing disposed within said outer casing, ahollow slotted screw shaft rotatably mounted within said inner casing, aroller bearing for said screw shaft, a hammer element in said outercasing, a compression spring, a springpressed pawl engaging said screwshaft, means for rotating said screw shaft to move said hammer elementand compress said compression spring, and means 'adjustable lengthwiseof said hollow screw for effecting the release of said pawl atpredetermined points to vary the force and frequency of the blows ofsaid hammer element.

7. A device.of the class described, comprising an outer casing, an innercasing disposed within the upper portion of said outer casing, a hollowscrew rotatably 'mounted within said'inner casing, said screw having alongitudinally extending slot, a smaller screw disposed within saidhollow screw, a nut on said smaller; screw, a trip member on said nutand projecting outwardly through sald slot in said hollow screw, meansfor rotating said hollow screw, a hammer shaft, a collar on said hammershaft, a compression spring engaging said collar, a shank secured tosaid hammer shaft, a springpressed pawl on said shank to engage saidollow screw, and means for holding said pawl in a disengaged positionwith respect to said 4hollow screw during the driving stroke of saidhammer.

8. In a device of the class described, a hammer element, an actuatingmember arranged in substantially axial alinement therewith, a spiralthread provided on said member, means provided on said hammer elementand engaged by said thread to effect the movement of the hammer elementin a Signed at Seattle, Washington, this 28th direction axially of saidmember when the day of August, 1915.

latter is suitably rotated, and a spring GEORGE L. KOLLUCK. adapted toimpel the hammer element in a, ROBERT P. MARTIN.

'a contrary direction and axially of said mem- Witnesses:

ber when said means is freed from said E. PETERSON,

thread. HORACE BARNES.

